JP2007300366A - Microwave wireless communication system with low power consumption - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide system constitution of economical equipment by suppressing power consumption while securing reliability of a microwave wireless system having an in-use and a standby line. <P>SOLUTION: When the equipment is normal and wireless propagation characteristics in space are stable after the system is actuated in normal hot standby mode, a master standby line mode control section 15 outputs a power-saving-mode setting signal and the standby line (a transmitter 3 and a receiver 5) is set to a power saving mode. When there is a sign thereafter that in-use equipment gets out of order or that the wireless propagation characteristics in space deteriorate, a master standby line mode control section 15 outputs a power-saving-mode reset signal and the standby line enters a hot standby mode to switch the system to a normal in-use/standby system. Further, when a BER value becomes worse than a set value, a line switching control section 13 outputs a line switching control signal to perform switching to the standby line in the host standby mode in a short time. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a microwave radio communication system having a TWIN-PATH configuration having a working line and a protection line.

  In the microwave radio system, in order to improve the reliability of the line, a duplex configuration having a working device and a spare device is often adopted. In this redundant configuration, a hot standby system is employed in which both the active and standby devices are in an operable state and the active and standby switching is performed, thereby shortening the switching time between the active and standby (Patent Document 1). To 3).

  Moreover, the channel quality of the microwave radio system is affected by the radio propagation characteristics of the space in addition to the equipment failure. For this reason, when ensuring reliability, the wireless communication device and the wireless communication path are configured redundantly. Furthermore, the transmission output is set so that a certain level of line quality can be ensured even if it is affected by the environment such as spatial radio propagation characteristics, that is, weather conditions.

  FIG. 2 is a block diagram showing a microwave radio communication system in a TWIN-PATH configuration having a conventional ATPC (Automatic Transmitter Power Control) function and a protection line, with the left half on the opposite station side and the right half Indicates the local station side, the upper half indicates the downlink, and the lower half indicates the uplink.

  In FIG. 2, in a normal state, transmission data input from the input terminal 1 on the opposite station side is branched into two by the transmission switching unit 2 and output to the transmitter 3 and the transmitter 4, and the transmitter 3 and the transmitter 4 are transmitted. Is modulated into a radio frequency band and transmitted from each antenna. The transmission control unit 24 receives the transmission output level control signal from the partner station side, sends it to the transmitter 3 and the transmitter 4 via the transmission switching unit 2, and transmits the transmission output to the transmitter 3 and the transmitter 4. When a correction is instructed and a line switching control signal is received from the partner station, the line switching control signal is sent to the transmission switching unit 2. Upon receiving this line switching control signal, the transmission switching unit 2 stops transmission of transmission data to the active transmitter 4 and performs transmission switching so as to transmit transmission data only to the spare transmitter 3. The working line and the protection line are switched between the transmitter 3 and the transmitter 4.

  On the other hand, on the own station side, the receiver 5 outputs a reception signal from the transmitter 3 to the reception switching unit 7, and the receiver 6 outputs a reception signal from the transmitter 4 to the reception switching unit 7. An RSL (Receiving Signal Level) detection unit 10 detects an RSL from the reception signals of the receiver 5 and the receiver 6 and outputs an RSL value to the ATPC control unit 12. When the ATPC control unit 12 inputs the RSL measurement value from the RSL detection unit 10, the ATPC control unit 12 outputs the transmission output level control information that increases or decreases the transmission output level of the transmitter of the opposite station to the transmission switching unit 22 on the local station side, and via the uplink Is transmitted to the transmission control unit 24 of the opposite station. The transmission control unit 24 executes the transmission output level control of the transmitter 3 and the transmitter 4 based on the transmission output level control information received from the ATPC control unit 12.

  The BER (Bit Error Rate) detection unit 9 calculates a BER from the reception signals of the receiver 5 and the receiver 6 and outputs the BER value to the line switching control unit 13. The line switching control unit 13 inputs the BER measurement value from the BER detection unit 9, and when the BER value of the working line is equal to or less than a preset BER value and the reception state is good, the working line (transmitter 4, When the signal transmitted by the receiver 6) is selected and the BER value of the working line is worse than the preset BER value, the line switching information for switching from the working line to the protection line is received control. The data is output to the unit 11 and also output to the transmission switching unit 22 on the local station side and transmitted to the transmission control unit 24 of the opposite station via the uplink.

  When receiving line switching information from the line switching control unit 13, the reception control unit 11 outputs a line switching signal to the reception switching unit 7. The reception switching unit 7 normally selects the receiver 6 and sends the reception data output from the receiver 6 to the output terminal 8, but when a line switching signal is input from the reception control unit 11, the standby switching unit 7 Receiver 5 is selected. When the transmission control unit 24 receives the line switching signal from the line switching control unit 13, the transmission control unit 24 transmits the transmission data input from the input terminal 1 to the standby transmitter until the failure or maintenance state of the working line is released. The transmission switching unit 2 is switched so as to output only to 3.

  The local station side transmitter 20 and the transmitter 21 have the same functions as the above-mentioned opposite station side transmitter 3 and transmitter 4 and transmit the input information and signal to the opposite station side receiver 18 and receiver 19. To do. The opposite station side receiver 18 and the receiver 19 also have the same functions as the above-mentioned local station side receiver 5 and the receiver 6, and the information and signals received from the transmitter 20 and the transmitter 21 are sent to the reception switching unit 17. Output. The reception switching unit 17 has the same function as the reception switching unit 7, selects one of the reception data input from the receiver 18 or the receiver 19, and sends it to the output terminal 16. The transmission output level control information and the line switching information transmitted from the partner station are output to the transmission control unit 24.

  Next, the line switching operation in the conventional microwave radio communication system shown in FIG. 2 will be described.

  The BER of the spare receiver 5 and the active receiver 6 is input from the BER detector 9 to the line switching controller 13. In the line switching control unit 13, a BER threshold value is set in order to determine that a line failure including a device failure and a deterioration in the wireless propagation characteristics of the space occurs. When the BER value exceeds the threshold value, the line switching control unit 13 outputs the line switching information to the reception control unit 11 and transmits the line switching information to the transmission control unit 24 of the opposite station. The data is transmitted through the machine 20 or the transmitter 21, the receiver 18 or the receiver 19, and the reception switching unit 17.

  Upon receiving the line switching information, the transmission control unit 24 instructs the transmission switching unit 2 to switch the line so that the transmitter 3 is selected. Further, when the line switching information is input from the line switching control unit 13, the reception control unit 11 outputs a line switching signal to the reception switching unit 7, and the reception switching unit 7 receives the receiver according to the line switching signal input from the reception control unit 11. 5 is selected. Line switching is performed in the series of flows described above. In addition, the transmission switching units 2 and 23 may be configured by a branch circuit such as a hybrid circuit, and a configuration in which the operation of the transmitter 4 is directly stopped by a line switching signal may be employed.

Japanese Patent Laid-Open No. 7-86989 JP-A-9-8706 Japanese Patent Laid-Open No. 11-41146

  In the hot standby system, both the active and standby devices are set in an operable state, and the active and standby devices are switched. Therefore, switching to the standby device is immediately executed, and the switching time between the active and standby devices can be shortened. On the other hand, there is a problem that power consumption is large because the spare device must be kept in an always operating state.

  Because of the reliability of recent wireless devices, the probability of failure is considered to be low, and the deterioration of the wireless propagation characteristics of the space that affects the line quality is considered to be small when converted to annual units. The system configuration is simplified and the power consumption is reduced by adopting ATPC which reduces the total power consumption by varying the transmission output within a certain range according to the system without a spare and the radio propagation characteristics of the space Although a method has also been proposed, it is necessary to use a redundant configuration in order to maintain the reliability of the microwave radio system, and it is necessary to set the transmission output to a level with a margin, which is not applicable to a system that requires high reliability. .

  In addition, in a system without a reserve, even if it has an ATPC function, it may not be possible to ensure channel quality against fading or radio wave interference peculiar to a radio channel that affects the radio propagation characteristics of space.

  In view of the above problems, the object of the present invention is to operate as a standby-free system in a steady state, i.e., when the equipment is normal and the radio propagation characteristics of the space are good. System configuration with economical equipment that reduces the power consumption while ensuring the reliability of the microwave radio system by enabling active configuration change to a system with spare when signs of deterioration of propagation characteristics appear It is to provide means for realizing the above.

  The present invention has a TWIN-PATH configuration having a working line and a protection line, and a microwave having a function (ATPC) for automatically controlling the transmission output level on the transmission side based on the reception input level (RSL) information on the reception side In a wireless communication system, in a normal state, power consumption is suppressed as a configuration virtually without a protection line (hereinafter referred to as a power saving mode). From that state, when the BER detected by the receiver approaches the preset value for switching to the protection line, or when the RSL decreases significantly thereafter due to changes in humidity and rain conditions (hereinafter collectively referred to as weather conditions) If predicted, the system is changed to a system with a spare (hereinafter referred to as hot standby mode) in preparation for line switching.

  Specifically, it has a TWIN-PATH configuration with working and protection lines, and automatically controls the transmission output level on the transmission (opposite station) side based on the reception input level (RSL) information on the reception (own station) side In a microwave radio communication system having a function to perform (ATPC), a mode switching control signal that is arranged on the receiving side and switches the protection line mode between the power saving mode and the hot standby mode based on the receiving state of the receiving side The standby protection receiver mode control unit for controlling the standby receiver on the receiving side to switch to the power saving mode or the hot standby mode, and the mode switching control signal output from the master protection channel mode control unit, Means for transmitting to the transmitting side via an uplink, and a master protection line mode on the receiving side, arranged on the transmitting side. Slave standby line that receives the mode switching control signal output from the mode control unit and controls the spare transmitter on the transmitting side to switch to the power saving mode or the hot standby mode according to the received mode switching control signal A mode control unit is provided.

  The receiving side detects a humidity and / or rain condition and outputs it to the master backup line mode control unit, a weather sensor for detecting RSL at regular intervals, a BER detection unit for detecting BER at regular intervals The master protection channel mode control unit determines the reception state on the receiving side based on the output from these sensors or the detection unit, and outputs the mode switching control signal according to the determination result.

  In the present invention, the power consumption of the entire system is reduced by actively changing the configuration without a protection channel and the configuration with a protection channel to the configuration of the microwave radio communication system having the ATPC function. The feature is that it is possible to maintain the reliability of the line.

  That is, a means for detecting the BER at a certain time on the receiving side, a means for detecting a weather condition, a means for detecting the RSL at a certain time, and switching of the system configuration according to the BER, the RSL, and the weather condition (mode) Switching means), means for transmitting information for controlling the mode switching of the protection channel to the transmitter of the opposite station, and the transmission side of the opposite station controls the mode switching of the protection channel according to the received control information. As a result, in the normal state, the protection line is operated in the power saving mode, i.e., no protection mode, and when the RSL is predicted to decrease due to the weather condition or the operation of line switching due to the deterioration of the BER is predicted. Switch the system configuration to standby mode.

  As described above, according to the present invention, the BER and weather conditions are detected on the receiving side, and when the BER deterioration is detected or the RSL is predicted to be significantly lowered from the weather conditions, the mode of the protection line is switched on the own station, that is, the receiving side. The switching information is transmitted to the opposite station, and the protection station mode is switched at the opposite station.

  In other words, in a steady state, that is, when the device is normal and the radio propagation characteristics of the space are good, the standby line is put into a power saving mode to virtually operate as a standby-free system to save power. When there is a sign of failure or a sign of deterioration in the radio propagation characteristics of the space, the system configuration is switched to a normal protection line, and then the line is switched reliably and promptly when the line is switched. Therefore, it is possible to reduce the power consumption while ensuring the reliability of the microwave radio system, and to realize a system configuration with economical equipment.

  In the present invention, in a microwave radio communication system with a TWIN-PATH configuration having a working line and a protection line, in a normal state, by setting the protection line to a power saving mode, the system configuration is virtually set to a state without a protection, When line switching control is predicted, the system configuration is switched to the standby state before the line switching control is performed, so that the switching time is shortened and the power consumption is reduced while maintaining the reliability of the wireless line. be able to.

  FIG. 1 is a block diagram showing an embodiment of the present invention. As in the conventional example shown in FIG. 2, this embodiment is also a microwave radio communication system configuration in a TWIN-PATH configuration having an active and backup line having an ATPC function, the left half being the opposite station side, and the right half being The own station side, the upper half indicates the downlink, and the lower half indicates the uplink.

  In the present embodiment, the system configuration is made active by adding a weather sensor 14, a master protection channel mode control unit 15, and a slave protection channel mode control unit 25 to the conventional microwave radio communication system shown in FIG. It is characterized by having a mechanism to change to.

  In FIG. 1, transmission data input from the input terminal 1 on the opposite station side is branched by the transmission switching unit 2 and output to the transmitter 3 and the transmitter 4, and is transmitted to the radio frequency band by the transmitter 3 and the transmitter 4. Modulated and transmitted from each antenna. Further, based on the transmission output level control signal input from the transmission control unit 24 via the transmission switching unit 2, the transmitter 3 and the transmitter 4 are instructed to correct the transmission output, and also input from the transmission control unit 24. Based on the line switching control signal, the working line and the protection line are switched between the transmitter 3 and the transmitter 4.

  When the slave standby channel mode control unit 25 on the opposite station side receives the protection channel mode switching signal from the master standby channel mode control unit 15 on the own station side, which will be described later, through the transmission control unit 24, the transmitter 3 enters the power saving mode. . When a sign indicating that the communication state of the working line deteriorates appears and a mode switching signal indicating recovery from the standby line is received from the master protection line mode control unit 15, the transmitter 3 is returned to the hot standby mode, and then the line switching control signal When this occurs, the standby line is quickly set up so that the working line can be switched to the standby line.

  The receiver 5 outputs a reception signal from the opposite station side transmitter 3 to the reception switching unit 7, and the receiver 6 outputs a reception signal from the opposite station side transmitter 4 to the reception switching unit 7. The BER detection unit 9 calculates the BER from the reception signals of the receiver 5 and the receiver 6 and outputs the BER value to the line switching control unit 13 and the master protection line mode control unit 15. The RSL detection unit 10 detects the RSL from the reception signals of the receiver 5 and the receiver 6 and outputs the RSL value to the ATPC control unit 12 and the master protection channel mode control unit 15.

  When the ATPC control unit 12 inputs the RSL measurement value from the RSL detection unit 10, the ATPC control unit 12 outputs transmission output level control information that raises or lowers the transmission output level of the transmitter of the opposite station to the transmission switching unit 22. To the transmission control unit 24. The transmission control unit 24 controls the transmission output levels of the transmitter 3 and the transmitter 4 based on the transmission output level control information received from the ATPC control unit 12.

  The line switching control unit 13 receives the BER measurement value from the BER detection unit 9 and receives the line switching information in order to perform switching control from the working line to the protection line when the BER value is worse than a preset BER value. The data is output to the control unit 11 and the transmission switching unit 22. When receiving line switching information from the line switching control unit 13, the reception control unit 11 outputs a line switching signal to the reception switching unit 7. The reception switching unit 7 selects the receiver 5 based on the line switching signal input from the reception control unit 11. When the transmission control unit 24 receives the line switching signal from the line switching control unit 13, the transmission control unit 24 transmits the transmission data input from the input terminal 1 to the standby transmitter until the failure or maintenance state of the working line is released. The transmission switching unit 2 is switched so as to output only to 3.

  The meteorological sensor 14 detects humidity and rainfall information and outputs the detected information to the master protection line mode control unit 15. The master protection line mode control unit 15 sets a value lower than the BER value for switching from the working line to the protection line by a predetermined level as a condition value for switching the protection line mode as the protection line mode switching level. Has been. This set value is determined in consideration of the time during which the state change of the protection line can be completed before the BER further deteriorates and the line switching control is performed. The master protection channel mode control unit 15 stores in advance correlation information of humidity information, rainfall information, and RSL information that can determine the possibility of rain attenuation and the possibility of fading.

  The master protection line mode control unit 15 inputs a BER measurement value from the BER detection unit 9 and inputs humidity and rainfall information from the weather sensor 14. When the BER measurement value is worse than the protection channel mode switching level and when a decrease in RSL is predicted, the protection channel mode switching information is output to the receiver 5 and the transmission switching unit 22. The transmission switching unit 22 receives the transmission output level control signal from the ATPC control unit 12, the line switching information from the line switching control unit 13, and the protection line mode switching information from the master protection line mode control unit 15, and transmits the transmitter 20 or The main signal is output to the selected line of the transmitter 21.

  The transmitter 20 and the transmitter 21 have the same functions as the transmitter 3 and the transmitter 4 described above, and transmit input information and signals to the receiver 18 and the receiver 19. The receiver 18 and the transmitter 19 have the same functions as the receiver 5 and the receiver 6, and output information and signals received from the transmitter 20 or the transmitter 21 to the reception switching unit 17. The reception switching unit 17 has the same function as the reception switching unit 7, and outputs transmission output level control information, line switching information, and protection line mode switching information input from the receiver 18 or 19 to the transmission control unit 24. .

  The transmission control unit 24 outputs a transmission output level control signal and a line switching signal to the transmission switching unit 2 from the input information, and outputs a protection channel mode switching signal to the slave protection channel mode control unit 25. Note that the BER detection unit 9, the RSL detection unit 10, the ATPC control unit 12, the line switching control unit 13, the reception control unit 11, the weather sensor 14, the master protection line mode control unit 15, the slave protection line mode control unit 25, and transmission control. The unit 24 is assumed to have the same configuration on the opposite station side.

  Next, operations of protection channel mode control and channel switching control in the present embodiment shown in FIG. 1 will be described.

  When the system starts up, it starts as a normal spare system. When the equipment is normal and the radio propagation characteristics of the space are stable, a power saving mode setting signal is output from the master protection channel mode control unit 15 and the protection channel is set to the power saving mode. After that, when there is a sign of failure of the working equipment or a sign of deterioration of the radio propagation characteristics of the space, a power saving mode release signal is output from the master protection line mode control unit 15 and the protection line becomes the hot standby mode and there is normal protection Changed to system. Further, when the BER value becomes worse than the set value, a line switching control signal is output from the line switching control unit 13, but at that time, the standby line is in the hot standby mode, so the line switching is executed in a short time. . Hereinafter, these operations will be described in detail in order.

1) Operation at System Startup The master protection channel mode control unit 15 includes an RSL value from the RSL detection unit 10 to the standby receiver 5, and an RSL value of the active receiver 6, and from the BER detection unit 9 to the standby receiver 5. And the humidity and / or rainfall information from the weather sensor 14 are input. The master protection channel mode control unit 15 is set with a BER threshold value in order to detect a sign of deterioration of equipment failure. In addition, in order to detect the possibility of rain attenuation and the possibility of fading, that is, signs of deterioration in the radio propagation characteristics of the space, correlation information of humidity information, rainfall information, and RSL information is stored in advance.

  After a period of time when it can be determined that the device is normal and the radio propagation characteristics of the space are stable, the master protection channel mode control unit 15 instructs the standby receiver 5 to shift to the power saving mode and Control information for the power saving mode is transmitted to the slave protection channel mode control unit 25 of the station via the transmission switching unit 22, the transmitter 20 or the transmitter 21, the receiver 18 or the receiver 19, the reception switching unit 17, and the transmission control unit 24. Send.

  When receiving the control information to the power saving mode from the transmission control unit 24, the slave protection line mode control unit 25 instructs the standby transmitter 3 to shift to the power saving mode. With the above-described series of flows, this system is changed to a system without a reserve by the operation of only the current transmitter 4 and the current receiver 6.

2) Operation when there is a sign of equipment failure or a sign of deterioration in spatial radio propagation characteristics In the master protection channel mode control unit 15, if the BER value exceeds a threshold value, there is a sign of equipment failure deterioration. Then, the master protection channel mode control unit 15 sends the control information for canceling the power saving mode to the slave protection channel mode control unit 25 of the opposite station, the transmission switching unit 22, the transmitter 20 or the transmitter 21, the receiver 18 or Transmission is performed via the receiver 19, the reception switching unit 17, and the transmission control unit 24.

  When receiving the control information for canceling the power saving mode from the transmission control unit 24, the slave protection line mode control unit 25 instructs the standby transmitter 3 to cancel the power saving mode. Further, the master protection channel mode control unit 15 instructs the standby receiver 5 to cancel the power saving mode. With this series of flows, the spare transmitter 3 and the receiver 5 enter the hot standby mode, and the system is changed to a spare system.

  The threshold value of the BER at this time is set to a value lower than the BER value that triggers switching from the working line to the protection line, and the state of the protection line is changed until the BER value further deteriorates from this threshold value and the line switching control is performed. Is determined in consideration of the time that can be completed.

  Next, with respect to the operation when the sign of the deterioration of the radio propagation characteristics of space appears, the humidity and rainfall information input from the weather sensor 14 and the RLS value input from the RSL detection unit 10 are collated, In the case where a decrease in RSL is predicted from the humidity information and the correlation information between the rainfall information and the RSL information, which can be stored in the control unit 15 in advance and can determine the possibility of rain attenuation and the occurrence of fading. The power saving mode release control is performed in a sequence similar to the above-described sequence when the BER is deteriorated.

3) Operation in case of equipment failure or deterioration of spatial radio propagation characteristics The BER of the spare receiver 5 and the active receiver 6 is input from the BER detector 9 to the line switching controller 13. In the line switching control unit 13, a BER threshold value is set in order to determine that a line failure including a device failure and a deterioration in the wireless propagation characteristics of the space occurs. When the line switching control unit 13 detects that the BER value exceeds the set threshold value, the line switching control unit 13 outputs the line switching information to the reception control unit 11, and the line switching information is transmitted to the transmission switching unit 22, the transmitter 20, or the transmitter. 21, the signal is transmitted to the transmission control unit 24 of the opposite station via the receiver 18 or 19 and the reception switching unit 17.

  When receiving the line switching information, the transmission control unit 24 instructs the transmission switching unit 2 to switch the line so that the transmitter 3 is selected. The reception control unit 11 outputs a line switching signal to the reception switching unit 7 when the line switching information is input from the line switching control unit 13. The reception switching unit 7 selects the receiver 5 based on the line switching signal input from the reception control unit 11. Line switching is performed in the series of flows described above. Needless to say, before line switching, the system has already been changed to a system with a spare according to the above item 2).

  In the case of a microwave radio communication system having an ATPC function, since the deterioration of BER can be minimized by changing the transmission output within a certain range according to the radio propagation characteristics of the space, the frequency of switching to the backup line is relatively low. Therefore, the present invention has a TWIN-PATH configuration having a working line and a protection line, and transmits on the transmission (opposite station) side according to the reception input level (RSL) information on the reception (own station) side. This is extremely effective as a means for reducing power consumption in a microwave radio communication system having an automatic output level control function (ATPC).

  As described above, in the present embodiment, in addition to the conventional system configuration, the receiving side is provided with the master backup line mode control unit 15 that actively changes the system configuration and the weather sensor 14 that detects the humidity and the rainfall state, On the other hand, the transmission side is provided with a slave protection channel mode control unit 25 for receiving a protection channel mode switching control signal from the master protection channel mode control unit 15, and the system configuration is instructed by the instruction of the receiving side master protection channel mode control unit 15. Is made variable.

  The master protection channel mode control unit 15 determines whether or not the system configuration is possible from the BER information, the RSL information, the humidity, and the rainfall information at regular time intervals, and changes the system configuration in conjunction with the slave protection channel mode control unit 25. In the steady state, the system is operated as a backupless system. However, when the master backup line mode control unit 15 detects the deterioration of BER or the deterioration of RSL is predicted from the weather sensor information and the RSL information, the system without the backup is used. Change to a system with a spare.

  The judgment of BER deterioration is made based on whether or not the BER has deteriorated from a second set value lower than the BER value set in advance as a trigger for switching from active to standby, and the standby line is up when switching from active to standby. Make sure. In addition, the prediction of RSL degradation is based on the correlation information stored in advance in the master protection channel mode control unit, the input humidity information and rainfall information so that the possibility of rain attenuation and the possibility of fading can be determined. Although the determination is based on the correlation information of the RSL information, the RSL measurement value, the humidity information, or the rainfall information may be determined as a direct determination criterion. As a matter of course, it is ensured that the protection line comes up before the BER is deteriorated due to the deterioration of the RSL and the line is switched.

  In the above description, the mode in which the standby system is completely dropped in the steady state has been described. However, it is possible to improve reliability by changing whether there is a backup with a certain period or no backup according to the radio propagation characteristics of the space. It is.

  In the above-described embodiment, the operation in the downlink (direction from the transmitter 4 to the receiver 6) has been described. Needless to say, the same operation is performed in the uplink (direction from the transmitter 21 to the receiver 19). In addition, although the present embodiment is intended for the working 1 and spare 1 systems, it can be similarly implemented in a 1 + N system in which a plurality of working systems share one spare system.

It is a block diagram which shows embodiment of this invention. It is a block diagram which shows a prior art example.

Explanation of symbols

1,23 input terminal 2,22 transmission switching unit 3,4,20,21 transmitter 5,6,18,19 receiver 7,17 reception switching unit 8,16 output terminal 9 BER detection unit 10 RSL detection unit 11 reception Control unit 12 ATPC control unit 13 Line switching control unit 14 Weather sensor 15 Master protection channel mode control unit 24 Transmission control unit 25 Slave protection channel mode control unit

Claims (7)

A function (ATPC) that has a TWIN-PATH configuration with active and protection lines and that automatically controls the transmission output level on the transmission (opposite station) side based on the reception input level (RSL) information on the reception (own station) side In a microwave radio communication system having
Based on the reception state of the receiving side, the mode is switched to the power saving mode and the hot standby mode based on the reception state of the receiving side to output a mode switching control signal to power the standby receiver on the receiving side. A master protection channel mode control unit that performs switching control to a saving mode or a hot standby mode, and a means for transmitting the mode switching control signal output from the master protection channel mode control unit to the transmission side via an uplink, The mode switching control signal that is arranged on the transmission side and is output from the master standby channel mode control unit on the reception side is received, and the spare transmitter on the transmission side is power-saving in accordance with the received mode switching control signal It has a slave protection line mode control unit that controls switching to the mode or hot standby mode. Microwave communication system, characterized in that.   The receiving side includes a weather sensor that detects humidity and / or a rainfall condition and outputs the detected humidity and / or rainfall condition to the master protection line mode control unit, and the master protection line mode control unit includes the humidity and / or input from the weather sensor. When the value indicating the rain condition is equal to or less than a predetermined reference value, a mode switching control signal for setting the protection line to the power saving mode is output, and when the reference value is exceeded, the protection line is set to the hot standby mode. The microwave radio communication system according to claim 1, having a function of outputting a mode switching control signal.   The receiving side includes an RSL detection unit that detects RSL at regular intervals, and the master protection channel mode control unit has an RSL measurement value input from the RSL detection unit equal to or greater than a predetermined reference value. A function of outputting a mode switching control signal for setting the protection line to a power saving mode, and outputting a mode switching control signal for setting the protection line to a hot standby mode when the reference value falls below the reference value. The microwave radio communication system according to claim 1.   The receiving side includes a BER detection unit that detects BER at regular intervals, and the master protection channel mode control unit has a BER measurement value input from the BER detection unit equal to or lower than a predetermined reference value. A function for outputting a mode switching control signal for setting the protection line to a power saving mode, and a mode switching control signal for setting the protection line to a hot standby mode when the reference value is exceeded. The microwave radio communication system according to claim 1.   The receiving side includes a meteorological sensor that detects humidity and / or rainfall conditions and outputs it to the master protection channel mode control unit, and an RSL detection unit that detects RSL at regular intervals, and the master protection channel mode control The unit compares the correlation information indicating the possibility of rain attenuation and the possibility of fading that is stored in the master protection channel mode control unit in advance with the correlation information of the input humidity information, rainfall information, and RSL information. The microwave radio communication system according to claim 1, further comprising a function of outputting the mode switching control signal based on a comparison result.   The master protection channel mode control unit outputs a mode switching control signal for setting the protection channel mode to a hot standby mode when outputting a mode switching control signal for setting the protection channel mode to a power saving mode. 6. The microwave radio communication system according to claim 1, wherein the microwave radio communication system has a function of outputting at a constant cycle. The master protection line mode control unit is configured as a system including a plurality of working lines and one protection line, and the master protection line mode control unit determines whether the standby line mode is hot standby when the reception state of at least one of the plurality of working lines is 2. A function for outputting a mode switching control signal for setting a mode of the protection line to a hot standby mode when a criterion for outputting a mode switching control signal for setting a mode is satisfied. The microwave radio | wireless communications system of any one of -6.

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